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El Niño

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

El Niño (Sp. (Christ) ‘child’) Warm surface current that flows in the equatorial Pacific Ocean towards the South American coast. It occurs around Christmas time. An easing or reversing of the trade winds over the s Pacific Ocean, causes warm surface waters that have ‘piled-up’ in the w Pacific to flow back and warm the coastal waters of South America by 2 to 3°C. It has a dramatic effect on climate patterns in Australia and Southeast Asia, and may affect rainfall as far away as Africa. In normal years, trade winds blow e to w along the Equator, dragging warm surface waters into a pool off n Australia and monsoon rains to Indonesia. In the w Pacific, the Humboldt Current pushes the surface waters away from the coast of Peru, bringing cold water to the surface. This upwelled, nutrient-rich water stimulates phytoplankton production and swells the population of anchovies, a mainstay of the Peruvian fishing industry. In an El Niño year, the upwelling ceases and the biological productivity of the area collapses. In 1982–83, the anchovy catch fell by 600%. In addition, mean sea-level along the coast of Latin America may increase by as much as 50cm (20in), causing widespread flooding. Some scientists believe that the frequency (presently every 2–10 years) and effects of El Niño may be increasing.

http://www.elnino.noaa.gov

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